Silent stock tubing



Dec. 19, 1950l W. D. coRLET1-,JR I 2,534,811

SILENT STOCK TUBING Filed Sept. 3, 1946 @IQ/Ihm.

Patented Dec. 19, 1950 SILENT STOCK TUBING Webster D. Corlett, Jr., Chicago, Ill., assignor to Corlett-Turner Co., Chicago,

of IllinoisV Y III., a corporation Application September 3, 1946, Serial No. 694,581

(Ci. E38-64) 9i Claims. l

This invention relates to a work holding or supporting means, and itY has for one object to provide a mounting or finishing means for such a holder. In general', in the particular form here illustrated', the invention is shown and described in connection with what'is usually called a stock tube. Such tubes find' one use in connection with screw machine or other metalworking deviceS, and the invention is illustrated in that connection.

Another object is to provide a suitable, quiet or cushioning stock tube to reduce the sound incident to its use.

Another object is to provide an end construction whereby the various parts, which are assembled together in the stock tube are properly and firmly held in suitable relation.

A further objectV is to provide an end construction so arranged that tubes of varying length may be readily finished and assembled with a minimum of effort and without machining.

Other objects will appear from time to time throughout the specification and claims.

This invention is illustrated more or less diagrammatically in the accompanying drawings, wherein:

Figure 1 is a diagrammatic side elevation of thetube as in use; and

Figure 2 is a longitudinal section taken on an enlarged scale, illustrating the end construction of the stock tube.

Like parts are indicated by like characters `throughout the specication and the drawings.

The stock tube includes an outer shell or casing l which is tubular in shape and preferably, although notnecessarily, made of metal. Within this tube is positioned a helically wound or otherwise shaped liner 2. which is preferably in the form. of a metallic helix which may or may not be formed of spring material.

The shell or outer casing l', as shown in Figure 2, is longer than the liner which it encloses and overlaps its ends, and' is arranged as will be described below to hold the various parts in place.

Between the liner and the casing or shell is mounted sound' absorbent material. In the particular form here shown this includes an outer layer 3 and an. inner layer 4 of sound absorbent wrapping. These may be felt, cloth, fabric or material of any sort which is relatively yielding and cushioning to act as a sound absorbent means.

The encl construction includes a hollow insert 5. On its exterior it is preferably tapered,A as at 6, and is shaped to provide a shoulder '1;

In assembly a liner of suitable length is provided and one or more wrappings or other arrangements of sound absorbent material are positioned about the liner; The liner with the wrappings in place is' then inserted into the shell or casing l. The end member 5 is then forced into place and, 'as shown, expands the liner outwardly. Preferably, also, the outermost layer of wrapping 3 is somewhat longer than the innermost layer 4'. This is not essential but is :a useful feature. If only a single layer of sound absorbent material is provided instead of the two layers 3A and 4 this layer may be taperedA internally.

With the parts assembled as shown, the shell or casing l. is spun or otherwise forced inwardly to form the groove 28' which lits against the shoulder 'l and against the end ofthe liner 2. The outer end or edge of the member l is then spun or otherwise shaped inwardly, as at 9, to enclose theY insert 5 and to hold the parts in place. The insert. 5 with its tapered exterior E may readily and conveniently be driven into place to hold the liner 2 tightly in place and to compress or Wedge theY sound absorbent material in place in its end between the member I` and the member 2.

Thus the parts are held against undue vibration or rattling at this point, and the entire assembly is` readily and conveniently secured together without machining or othei` comparable operations.

The, construction at each end of the stock tube is preferably the same, and the stock tube thus becomes a unit which is conveniently and readily made and in which the various parts which make up the unit are readily assembled together. The soundabsorbent material preferably extends from end to end of the liner, although it could be interrupted without departing from the spirit of the invention..

Although Ihave shown an operative form of my invention, it will be recognized that many changes in the form, shape and arrangement of parts can be made without departing from the spirit of the invention, and' my showing. is therefore to be taken as, in asense, diagrammatic.

The use and operation of this invention are as follows 3 action of the tool itself or by other feeding means.

The invention and its use are not limited to any particular tool or feed. One or more of the stock tubes may be assembled in a unit to feed either to a single or to a multiple machine at the same time.

While the device may be assembled in many ways it is convenient to secure the tapered end pieces 5 on a relatively long steel mandrel with the inner lining 2 compressed between two end pieces; the mandrel is then rotated with the liner and the cushioning wrapping 3, 4 is built up to the required diameter or thickness. The outer tube l is then slipped over this assembly and the ends. are rolled or otherwise shaped in the provided depressions 8 and the inwardly bent flanges 9 to hold the device assembled. tapered members 5 thus securethe liner to the outer tube l and the liner cannot move rela- `tivelylongitudinally with relation to the outer tube and cannot protrude from the ends of the tube. The liner is preferably in the form of a closely wound spring Which cannot be further compressed longitudinally and hence cannot back ofi` of the tapered surfaces of the end pieces 5 and become loose from them.

I claim:

l. In combination in a work supporting member, a wound and compressed metal liner, and means for supporting said liner comprising a rigid housing of greater diameter than the liner, the liner being mounted therein, and sound absorbent material positioned between the liner and the housing, and means for securing the liner in position within the housing, said means including' a hollow insert, said insert having a tapered exterior driven into the liner at its end and expanding it, said insert shaped with an external stop member, said housing being shaped to t against said stop member and against the end of said liner, said housing being also shaped about the outer end of said insert and holding said insert in xed position.

2. In combination in a work supporting member, a helically wound and compressed metal liner, and means for supporting said liner comprising a rigid housing of greater diameter than the liner, the liner being mounted therein, and sound absorbent material positioned between the liner and the housing, and means for securing the liner in position within the housing, said means including a hollow insert, said insert having a tapered exterior driven into the liner at its end and expanding it, said insert shaped with an external stop member, saidhousing having an inwardly directed member spaced away from its ends and shaped to nt against said stop member and against the end of said liner, said housing being also shaped about the outer end of said insert and holding said insert in xed position.

3. YIn combination in a work supporting member, a tightly wound metal liner, and means for supporting said liner comprising a rigid metallic housing of greater diameter than the liner, the liner being mounted therein, and sound absorbent material positioned between the liner and the housing, and means for securing the liner in position within the housing, said means including a hollow insert, said insert having a tapered exterior driven into the liner at its end and expanding it, said insert shaped with an external stop member, said insert being-effective, when in place, to hold adjacent turns of said liner in The contact with each other, said housing beingA against the end of said liner, said housing being also shaped about the outer end of said insert and holding said insert in xed position.

4. In combination in a work supporting member, a helically wound and compressed metal liner, andmeans for supporting said liner comprising a rigid metallic housing of greater diameter than the liner, the liner being mounted therein, and sound absorbent material positioned between the liner and the housing, and means for securing the liner in position within the housing, said means including a hollow insert, said insert having a tapered exterior driven into the liner at its end and expanding it, said insert shapedY with an external stop member, said housing being shaped to fit against said stop member and against the end of said liner, said housing being also shaped about the outer end of said insert and holding said insert in xed position.

5. In combination `in a workvsupportingj member, a tightly wound metal liner, and means for supporting said liner comprising a rigid metallic housing of greater diameter than the liner, the liner being mounted therein, and sound absorbent material positioned between the liner and the housing and supporting the linerV within the housing in cushioned relationship with respect thereto, and means for securing the liner inposition within the housing, said means including a hollow insert having` an internal diameter substantially that of the unilexed liner, said insert having a tapered exterior driven into vthe liner at its end and expanding it,-said insert shaped with an external stop member, said insert`,'when in place, being eifective to hold adjacent turns of said liner in contact with each other, said housing being shaped to fit against said stop member and against the end of said liner, said housing being also shaped about the outer endof said insert and holding said insert in fixed position.

6. In combination in a Vwork supporting member, a helically wound and compressed metal liner, and means for Vsupporting said liner comprising a rigid lmetallic housing of greater diameter thanV the liner, the liner being ,mounted therein, andsound absorbent material positioned between the liner and the housing and supporting `the liner within the housing in cushioned relationship with respect thereto, andmeans for securing the liner in position within the housing, said means including a hollowinsert having an internal diameter substantially that'of the unvflexed liner, said insert having a tapered exterior driven into the liner at its end and expand- Ving it, said insert shaped with an external stop member, said housing being shaped'to fit against vsaid stop member and against the end of said ,and said spring, said securing means comprising a Vhollow insert having a taperedvand shouldered exterior, said insert` being fitted within saidtubular member and within said spring and being of ,such exterior diameter that it expands said spring, a portion of said tubular member being .shaped inwardly about said shoulder, anda portion of said tubular member being shaped about the outer end of saidinsert and securing the same in place.-

8.l Means for securing together the parts of a work-supporting assembly, which assembly comprises a tubular member, a flexible spring therein, and sound absorbing means between said tube and said spring, said securing means comprising a hollow insert having a tapered and shouldered exterior, said insert being tted wholly within said tubular member and partially within said spring and being of such exterior diameter that it expands said spring, a portion of said tubular member being shaped inwardly about said shoulder, and a portion of said tubular member being shaped about the outer end of said insert and securing the same in place.

9. Means for securing together the parts of a Work-supporting assembly, which assembly comprises a tubular member, a flexible, tightly wound helical spring therein, and sound absorbing means between said tube and said spring, said securing means comprising a hollow insert having a tapered and shouldered exterior, said in- 20 sert being tted Within said tubular member and within said spring and being of such exterior diameter that it expands said spring, a portion of said tubular member being shaped inwardly about said shoulder, and a portion of said tubular member being shaped about the outer end of said insert and securing the same in place, said spring, tubular member and insert being so proportioned that the insert when in position holds the convolutions of said spring in contact with each other.

WEBSTER D. CORLETT, JR.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 690,744 Line Jan. 7, 1902 1,891,290 Tessky Dec. 20, 1932 

